// 无意义
let str: 123 = 123

let ar: '4564' = '4564'
// let ar: '4564' = '6546'   xxxx字面量类型必须和值一致

// 有意义
type st = 'left' | 'right' | 'center'
function chang(align: st) {
    console.log(align);

}
chang('left')
export { }